Arizona water hardness by city
Phoenix reports 172–302 mg/L (10–17.6 gpg) in its 2025 report. Most of that range is very hard. The City of Phoenix Water Services Department prints the range on page 4 of its 2025 Water Quality Report and publishes no average.
How hard the water is in each Arizona city
| City | Utility | Hardness (as published) | USGS class | Source year |
|---|---|---|---|---|
| Phoenix, AZ | City of Phoenix Water Services | No average; range 172–302 mg/L · 10–17.6 gpg | Very hard (low end: hard) | 2025 report |
Other Valley cities
Scottsdale, Tempe, Mesa, Glendale, Chandler and other Valley cities run their own utilities and publish their own reports.
Sources
- City of Phoenix, 2025 Water Quality Report (PDF): https://www.phoenix.gov/content/dam/phoenix/waterservicessite/documents/wsdprimarywqr.pdf
- USGS, Hardness of Water: https://www.usgs.gov/water-science-school/science/hardness-water